/* Config */
:root {
  --sk-size: 40px;
  --sk-color: #333;
}

/* Utility class for centering */
.sk-center {
  margin: auto;
}

/*  Plane

      <div class="sk-plane"></div>
 */
.sk-plane {
  width: var(--sk-size);
  height: var(--sk-size);
  background-color: var(--sk-color);
  animation: sk-plane 1.2s infinite ease-in-out;
}

@keyframes sk-plane {
  0% {
    transform: perspective(120px) rotateX(0deg) rotateY(0deg);
  }
  50% {
    transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
  }
  100% {
    transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
  }
}

/*  Chase

      <div class="sk-chase">
        <div class="sk-chase-dot"></div>
        <div class="sk-chase-dot"></div>
        <div class="sk-chase-dot"></div>
        <div class="sk-chase-dot"></div>
        <div class="sk-chase-dot"></div>
        <div class="sk-chase-dot"></div>
      </div>
 */
.sk-chase {
  width: var(--sk-size);
  height: var(--sk-size);
  position: relative;
  animation: sk-chase 2.5s infinite linear both;
}

.sk-chase-dot {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  animation: sk-chase-dot 2s infinite ease-in-out both;
}

.sk-chase-dot:before {
  content: "";
  display: block;
  width: 25%;
  height: 25%;
  background-color: var(--sk-color);
  border-radius: 100%;
  animation: sk-chase-dot-before 2s infinite ease-in-out both;
}

.sk-chase-dot:nth-child(1) {
  animation-delay: -1.1s;
}
.sk-chase-dot:nth-child(2) {
  animation-delay: -1s;
}
.sk-chase-dot:nth-child(3) {
  animation-delay: -0.9s;
}
.sk-chase-dot:nth-child(4) {
  animation-delay: -0.8s;
}
.sk-chase-dot:nth-child(5) {
  animation-delay: -0.7s;
}
.sk-chase-dot:nth-child(6) {
  animation-delay: -0.6s;
}
.sk-chase-dot:nth-child(1):before {
  animation-delay: -1.1s;
}
.sk-chase-dot:nth-child(2):before {
  animation-delay: -1s;
}
.sk-chase-dot:nth-child(3):before {
  animation-delay: -0.9s;
}
.sk-chase-dot:nth-child(4):before {
  animation-delay: -0.8s;
}
.sk-chase-dot:nth-child(5):before {
  animation-delay: -0.7s;
}
.sk-chase-dot:nth-child(6):before {
  animation-delay: -0.6s;
}

@keyframes sk-chase {
  100% {
    transform: rotate(360deg);
  }
}

@keyframes sk-chase-dot {
  80%,
  100% {
    transform: rotate(360deg);
  }
}

@keyframes sk-chase-dot-before {
  50% {
    transform: scale(0.4);
  }
  100%,
  0% {
    transform: scale(1);
  }
}

/*  Bounce

      <div class="sk-bounce">
        <div class="sk-bounce-dot"></div>
        <div class="sk-bounce-dot"></div>
      </div>
  */
.sk-bounce {
  width: var(--sk-size);
  height: var(--sk-size);
  position: relative;
}

.sk-bounce-dot {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: var(--sk-color);
  opacity: 0.6;
  position: absolute;
  top: 0;
  left: 0;
  animation: sk-bounce 2s infinite cubic-bezier(0.455, 0.03, 0.515, 0.955);
}

.sk-bounce-dot:nth-child(2) {
  animation-delay: -1s;
}

@keyframes sk-bounce {
  0%,
  100% {
    transform: scale(0);
  }
  45%,
  55% {
    transform: scale(1);
  }
}

/*  Wave

      <div class="sk-wave">
        <div class="sk-wave-rect"></div>
        <div class="sk-wave-rect"></div>
        <div class="sk-wave-rect"></div>
        <div class="sk-wave-rect"></div>
        <div class="sk-wave-rect"></div>
      </div>
 */
.sk-wave {
  width: var(--sk-size);
  height: var(--sk-size);
  display: flex;
  justify-content: space-between;
}

.sk-wave-rect {
  background-color: var(--sk-color);
  height: 100%;
  width: 15%;
  animation: sk-wave 1.2s infinite ease-in-out;
}

.sk-wave-rect:nth-child(1) {
  animation-delay: -1.2s;
}
.sk-wave-rect:nth-child(2) {
  animation-delay: -1.1s;
}
.sk-wave-rect:nth-child(3) {
  animation-delay: -1s;
}
.sk-wave-rect:nth-child(4) {
  animation-delay: -0.9s;
}
.sk-wave-rect:nth-child(5) {
  animation-delay: -0.8s;
}

@keyframes sk-wave {
  0%,
  40%,
  100% {
    transform: scaleY(0.4);
  }
  20% {
    transform: scaleY(1);
  }
}

/*  Pulse

      <div class="sk-pulse"></div>
 */
.sk-pulse {
  width: var(--sk-size);
  height: var(--sk-size);
  background-color: var(--sk-color);
  border-radius: 100%;
  animation: sk-pulse 1.2s infinite cubic-bezier(0.455, 0.03, 0.515, 0.955);
}

@keyframes sk-pulse {
  0% {
    transform: scale(0);
  }
  100% {
    transform: scale(1);
    opacity: 0;
  }
}

/*  Flow

      <div class="sk-flow">
        <div class="sk-flow-dot"></div>
        <div class="sk-flow-dot"></div>
        <div class="sk-flow-dot"></div>
      </div>
 */
.sk-flow {
  width: calc(var(--sk-size) * 1.3);
  height: calc(var(--sk-size) * 1.3);
  display: flex;
  justify-content: space-between;
}

.sk-flow-dot {
  width: 25%;
  height: 25%;
  background-color: var(--sk-color);
  border-radius: 50%;
  animation: sk-flow 1.4s cubic-bezier(0.455, 0.03, 0.515, 0.955) 0s infinite both;
}

.sk-flow-dot:nth-child(1) {
  animation-delay: -0.3s;
}
.sk-flow-dot:nth-child(2) {
  animation-delay: -0.15s;
}

@keyframes sk-flow {
  0%,
  80%,
  100% {
    transform: scale(0.3);
  }
  40% {
    transform: scale(1);
  }
}

/*  Swing

      <div class="sk-swing">
        <div class="sk-swing-dot"></div>
        <div class="sk-swing-dot"></div>
      </div>
 */
.sk-swing {
  width: var(--sk-size);
  height: var(--sk-size);
  position: relative;
  animation: sk-swing 1.8s infinite linear;
}

.sk-swing-dot {
  width: 45%;
  height: 45%;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  margin: auto;
  background-color: var(--sk-color);
  border-radius: 100%;
  animation: sk-swing-dot 2s infinite ease-in-out;
}

.sk-swing-dot:nth-child(2) {
  top: auto;
  bottom: 0;
  animation-delay: -1s;
}

@keyframes sk-swing {
  100% {
    transform: rotate(360deg);
  }
}

@keyframes sk-swing-dot {
  0%,
  100% {
    transform: scale(0.2);
  }
  50% {
    transform: scale(1);
  }
}

/*  Circle

      <div class="sk-circle">
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
        <div class="sk-circle-dot"></div>
      </div>
 */
.sk-circle {
  width: var(--sk-size);
  height: var(--sk-size);
  position: relative;
}

.sk-circle-dot {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
}

.sk-circle-dot:before {
  content: "";
  display: block;
  width: 15%;
  height: 15%;
  background-color: var(--sk-color);
  border-radius: 100%;
  animation: sk-circle 1.2s infinite ease-in-out both;
}

.sk-circle-dot:nth-child(1) {
  transform: rotate(30deg);
}
.sk-circle-dot:nth-child(2) {
  transform: rotate(60deg);
}
.sk-circle-dot:nth-child(3) {
  transform: rotate(90deg);
}
.sk-circle-dot:nth-child(4) {
  transform: rotate(120deg);
}
.sk-circle-dot:nth-child(5) {
  transform: rotate(150deg);
}
.sk-circle-dot:nth-child(6) {
  transform: rotate(180deg);
}
.sk-circle-dot:nth-child(7) {
  transform: rotate(210deg);
}
.sk-circle-dot:nth-child(8) {
  transform: rotate(240deg);
}
.sk-circle-dot:nth-child(9) {
  transform: rotate(270deg);
}
.sk-circle-dot:nth-child(10) {
  transform: rotate(300deg);
}
.sk-circle-dot:nth-child(11) {
  transform: rotate(330deg);
}
.sk-circle-dot:nth-child(1):before {
  animation-delay: -1.1s;
}
.sk-circle-dot:nth-child(2):before {
  animation-delay: -1s;
}
.sk-circle-dot:nth-child(3):before {
  animation-delay: -0.9s;
}
.sk-circle-dot:nth-child(4):before {
  animation-delay: -0.8s;
}
.sk-circle-dot:nth-child(5):before {
  animation-delay: -0.7s;
}
.sk-circle-dot:nth-child(6):before {
  animation-delay: -0.6s;
}
.sk-circle-dot:nth-child(7):before {
  animation-delay: -0.5s;
}
.sk-circle-dot:nth-child(8):before {
  animation-delay: -0.4s;
}
.sk-circle-dot:nth-child(9):before {
  animation-delay: -0.3s;
}
.sk-circle-dot:nth-child(10):before {
  animation-delay: -0.2s;
}
.sk-circle-dot:nth-child(11):before {
  animation-delay: -0.1s;
}

@keyframes sk-circle {
  0%,
  80%,
  100% {
    transform: scale(0);
  }
  40% {
    transform: scale(1);
  }
}

/*  Circle Fade

      <div class="sk-circle-fade">
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
        <div class="sk-circle-fade-dot"></div>
      </div>
 */
.sk-circle-fade {
  width: var(--sk-size);
  height: var(--sk-size);
  position: relative;
}

.sk-circle-fade-dot {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
}

.sk-circle-fade-dot:before {
  content: "";
  display: block;
  width: 15%;
  height: 15%;
  background-color: var(--sk-color);
  border-radius: 100%;
  animation: sk-circle-fade 1.2s infinite ease-in-out both;
}

.sk-circle-fade-dot:nth-child(1) {
  transform: rotate(30deg);
}
.sk-circle-fade-dot:nth-child(2) {
  transform: rotate(60deg);
}
.sk-circle-fade-dot:nth-child(3) {
  transform: rotate(90deg);
}
.sk-circle-fade-dot:nth-child(4) {
  transform: rotate(120deg);
}
.sk-circle-fade-dot:nth-child(5) {
  transform: rotate(150deg);
}
.sk-circle-fade-dot:nth-child(6) {
  transform: rotate(180deg);
}
.sk-circle-fade-dot:nth-child(7) {
  transform: rotate(210deg);
}
.sk-circle-fade-dot:nth-child(8) {
  transform: rotate(240deg);
}
.sk-circle-fade-dot:nth-child(9) {
  transform: rotate(270deg);
}
.sk-circle-fade-dot:nth-child(10) {
  transform: rotate(300deg);
}
.sk-circle-fade-dot:nth-child(11) {
  transform: rotate(330deg);
}
.sk-circle-fade-dot:nth-child(1):before {
  animation-delay: -1.1s;
}
.sk-circle-fade-dot:nth-child(2):before {
  animation-delay: -1s;
}
.sk-circle-fade-dot:nth-child(3):before {
  animation-delay: -0.9s;
}
.sk-circle-fade-dot:nth-child(4):before {
  animation-delay: -0.8s;
}
.sk-circle-fade-dot:nth-child(5):before {
  animation-delay: -0.7s;
}
.sk-circle-fade-dot:nth-child(6):before {
  animation-delay: -0.6s;
}
.sk-circle-fade-dot:nth-child(7):before {
  animation-delay: -0.5s;
}
.sk-circle-fade-dot:nth-child(8):before {
  animation-delay: -0.4s;
}
.sk-circle-fade-dot:nth-child(9):before {
  animation-delay: -0.3s;
}
.sk-circle-fade-dot:nth-child(10):before {
  animation-delay: -0.2s;
}
.sk-circle-fade-dot:nth-child(11):before {
  animation-delay: -0.1s;
}

@keyframes sk-circle-fade {
  0%,
  39%,
  100% {
    opacity: 0;
    transform: scale(0.6);
  }
  40% {
    opacity: 1;
    transform: scale(1);
  }
}

/*  Grid

    <div class="sk-grid">
      <div class="sk-grid-cube"></div>
      <div class="sk-grid-cube"></div>
      <div class="sk-grid-cube"></div>
      <div class="sk-grid-cube"></div>
      <div class="sk-grid-cube"></div>
      <div class="sk-grid-cube"></div>
      <div class="sk-grid-cube"></div>
      <div class="sk-grid-cube"></div>
      <div class="sk-grid-cube"></div>
    </div>
 */
.sk-grid {
  width: var(--sk-size);
  height: var(--sk-size);
  /* Cube positions
   * 1 2 3
   * 4 5 6
   * 7 8 9
   */
}
.sk-grid-cube {
  width: 33.33%;
  height: 33.33%;
  background-color: var(--sk-color);
  float: left;
  animation: sk-grid 1.3s infinite ease-in-out;
}
.sk-grid-cube:nth-child(1) {
  animation-delay: 0.2s;
}
.sk-grid-cube:nth-child(2) {
  animation-delay: 0.3s;
}
.sk-grid-cube:nth-child(3) {
  animation-delay: 0.4s;
}
.sk-grid-cube:nth-child(4) {
  animation-delay: 0.1s;
}
.sk-grid-cube:nth-child(5) {
  animation-delay: 0.2s;
}
.sk-grid-cube:nth-child(6) {
  animation-delay: 0.3s;
}
.sk-grid-cube:nth-child(7) {
  animation-delay: 0s;
}
.sk-grid-cube:nth-child(8) {
  animation-delay: 0.1s;
}
.sk-grid-cube:nth-child(9) {
  animation-delay: 0.2s;
}

@keyframes sk-grid {
  0%,
  70%,
  100% {
    transform: scale3D(1, 1, 1);
  }
  35% {
    transform: scale3D(0, 0, 1);
  }
}

/*  Fold

      <div class="sk-fold">
        <div class="sk-fold-cube"></div>
        <div class="sk-fold-cube"></div>
        <div class="sk-fold-cube"></div>
        <div class="sk-fold-cube"></div>
      </div>
 */
.sk-fold {
  width: var(--sk-size);
  height: var(--sk-size);
  position: relative;
  transform: rotateZ(45deg);
}
.sk-fold-cube {
  float: left;
  width: 50%;
  height: 50%;
  position: relative;
  transform: scale(1.1);
}

.sk-fold-cube:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--sk-color);
  animation: sk-fold 2.4s infinite linear both;
  transform-origin: 100% 100%;
}
.sk-fold-cube:nth-child(2) {
  transform: scale(1.1) rotateZ(90deg);
}
.sk-fold-cube:nth-child(4) {
  transform: scale(1.1) rotateZ(180deg);
}
.sk-fold-cube:nth-child(3) {
  transform: scale(1.1) rotateZ(270deg);
}
.sk-fold-cube:nth-child(2):before {
  animation-delay: 0.3s;
}
.sk-fold-cube:nth-child(4):before {
  animation-delay: 0.6s;
}
.sk-fold-cube:nth-child(3):before {
  animation-delay: 0.9s;
}

@keyframes sk-fold {
  0%,
  10% {
    transform: perspective(140px) rotateX(-180deg);
    opacity: 0;
  }
  25%,
  75% {
    transform: perspective(140px) rotateX(0deg);
    opacity: 1;
  }
  90%,
  100% {
    transform: perspective(140px) rotateY(180deg);
    opacity: 0;
  }
}

/*  Wander

      <div class="sk-wander">
        <div class="sk-wander-cube"></div>
        <div class="sk-wander-cube"></div>
        <div class="sk-wander-cube"></div>
        <div class="sk-wander-cube"></div>
      </div>
 */
.sk-wander {
  width: var(--sk-size);
  height: var(--sk-size);
  position: relative;
}

.sk-wander-cube {
  background-color: var(--sk-color);
  width: 20%;
  height: 20%;
  position: absolute;
  top: 0;
  left: 0;
  --sk-wander-distance: calc(var(--sk-size) * 0.75);
  animation: sk-wander 2s ease-in-out -2s infinite both;
}
.sk-wander-cube:nth-child(2) {
  animation-delay: -0.5s;
}
.sk-wander-cube:nth-child(3) {
  animation-delay: -1s;
}

@keyframes sk-wander {
  0% {
    transform: rotate(0deg);
  }
  25% {
    transform: translateX(var(--sk-wander-distance)) rotate(-90deg) scale(0.6);
  }
  50% {
    /* Make FF rotate in the right direction */
    transform: translateX(var(--sk-wander-distance)) translateY(var(--sk-wander-distance)) rotate(-179deg);
  }
  50.1% {
    transform: translateX(var(--sk-wander-distance)) translateY(var(--sk-wander-distance)) rotate(-180deg);
  }
  75% {
    transform: translateX(0) translateY(var(--sk-wander-distance)) rotate(-270deg) scale(0.6);
  }
  100% {
    transform: rotate(-360deg);
  }
}
